Lighting fixture



Patented May 3, 1927.

UNITED STATES",

P TE T-am.

f enosvEnor. P. ROBINSON, oE SUMMIT, AND WILL AM '1. LAGKWELL, or wEsTEIELn, NEW JERSEY; SAID ROBINSON ASSIGNOR, BY MESNE ASSIGNMENTS, T0 SAID WIL- LIAM '1. BLACKWELL.

LIGHTING FIXTURE.

Application filed June 7, 1924. Serial No. 718,449.

Our present invention relates generally to electriclight fixtures, and is particularly adapted for use upon the ce1l1ngs of kitchens, corridors and porches, 1n which fixtures it is desirable that lamps of 100 watts or over be employed, and lamps of suchcharacter are provided when the fixtures are installed.

It has been found in practice, that the efficiency of such fixtures is very commonly 1mpaired by the substitution of lamps of less ower, when the lamps originally provided ecome broken or burned out.

The object of our invention is to overcome this objection by providing a fixture that will not receive a lamp of less than 100 watt, thereby insuring uniform capaolty of the fixture.

The details of construction and o eration of our improved fixture are hereina ter particularly described.

In the accompanying drawing:

Figure 1 is a'. vertical central section of a lighting fixture embodying our inventlon.

Fig. 2 is an elevation of the stop member, detached, and

Fig. 3 is a bottom view of the same.

Similar reference characters denote like parts in all the views.

The body of the fixture comprisesa canopy 10 adapted to be secured to the ceiling in any suitable manner, such as by screws or bolts passed upwardly through holes 11 in the annular horizontal flange 12 on the canlielow said flange 12, the canopy is tapering and its bottom edge turned inwardlyforming an annular horizontal flange 13. Depending from the bottom of the canopy 10 is a shell 14, its top being of the same diameter as that of the lower end of the canopy and provided with an inturned annular horizontal flange 15, which contacts wlththe flange 13, at the bottom of the canopy, these flanges being secured together by any suitable means. Below this connection with the canopy 10, the shell 14 is curved downwardly and outwardly for a predetermined distance from which point it extends vet-t1- cally to its bottom, in which vertical portion there is provided spaced threaded bushings 16, for the reception of set screws 17 for supporting a globe or shade'18 in the customary manner.

The body of the fixture thus formed and having its outersurface coated with enamel,

as a unit.

A porcelain receptacle 19, is connected within'the body at the junction of its two members, the bottom of the receptacle being seated upon the flange 13 of the canopy 10, while the threaded metallic member 20 extends below the flange 15 on the. shell 14 and upon which is screwed a: porcelainring 21, between which and the flange 15, is preferably provided a rubber washer 22. The receptacle is thus securely held in the desired position within the body of the fixture, and furthermore strengthens the connection of the canopy 10 with the globe supporting shell 14.

23 denotes a stop member, which prevents alamp of less than 100 watt being connected with the receptacle 19. This member 23 is preferably formed from a flat piece of sheet metal, pressed into the form shown most clearly in Figs. 2 and 3. The circumference of the horizontal flange 24, at the top of the member 23, is slightly less than that of the circular vertical portion 25, of the bottom part of the shell 14, so that the said flange 24 fits snugly within the said vertical wall of the shell 14:, and contacts with the shoulder formed at the upper inner end of said vertical part of said shell, at which point it is preferably permanently secured within the shell by solder, or other suitable means.

The body of the member 23 is tapered below the flange 24 and is of a predetermined depth, its bottom edge being preferably bent inwardly forming a fiat horizontal flange 26, leaving a central opening 27. This opening 27 is of a size to permit the passage of the neck 28 of a lamp bulb 29 which contacts with the annular flange 27, when the plug 30 at the end of its neck 28, is screwed into the threaded metallic member 20, of the receptacle 19, the bottom of the member 23 being spaced below the lamp receptacle 19 at the precise distance to allow a lamp of 100 watts or over to be thus connected with the rece tacle.

Al lamps of less than 100 watt are pro vided with necks of lesslength than are lamps of 100 watt or over; it will thus be seen that if an effort is made to insert a lamp of less than 100 watt, its bulb Will contact with "the iflange '26, =before :itstneclc reaches the threaded member 20 (if-the re is preferably coated'with White enamel so of non-conductmg material screwed upon that owing to their relative positions, the light from the lamp striking this surface is reflected therefrom downwardly into till!) globe; this member therefore performs a very advantageous secondary 1ft1nction.

In lighting 'fixtures .of' the character to' which thls'mvention relatcs,1t 1s very des1rone that a certain and uniform'hghting capacity be maintained, andiitwill-readily be understood ithat by the employment \of our invention such object :is 1 assuredly accomplished.

e'claim as our invention:

In ailighting fixture comprising a canopy having .an inwardly turned annular-flange at its bottom, a shell having an inwardly turned wannul'ar flange": at 1tstop -1n contact with and corresponding With theflange on the-canopy, a lamp receptacle seated upon the flange on the canopy and having a threaded metallic member extending-below thefiange 'on"the top of'said shell, a ring saidthreaded member, a lamp stop secured avithin theshell below said receptacle at a predetermined distance therefrom and prothe lamp :receptacle, an incandescent lamp thence/ k of which'passes through-such openring "and into c'onnection'witlrsaid receptacle, :said lamp-stop permitting only of such connectionwhere the neck ofthe lamp bulb :is of a predetermined length.

Signed by us this 3rd day'of'June, 1924.

"GROSVENOR P. ROBINSON. WILLIAM -BLAGKW ELL. 

